// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_PROXY_PROXY_CONFIG_SERVICE_ANDROID_H_
#define NET_PROXY_PROXY_CONFIG_SERVICE_ANDROID_H_

#include <string>

#include "base/android/jni_android.h"
#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "net/base/net_export.h"
#include "net/proxy/proxy_config_service.h"

namespace base {
class SequencedTaskRunner;
}

namespace net {

class ProxyConfig;

class NET_EXPORT ProxyConfigServiceAndroid : public ProxyConfigService {
public:
    // Callback that returns the value of the property identified by the provided
    // key. If it was not found, an empty string is returned. Note that this
    // interface does not let you distinguish an empty property from a
    // non-existing property. This callback is invoked on the JNI thread.
    typedef base::Callback<std::string(const std::string& property)>
        GetPropertyCallback;

    // Separate class whose instance is owned by the Delegate class implemented in
    // the .cc file.
    class JNIDelegate {
    public:
        virtual ~JNIDelegate() { }

        // Called from Java (on JNI thread) to signal that the proxy settings have
        // changed. The string and int arguments (the host/port pair for the proxy)
        // are either a host/port pair or ("", 0) to indicate "no proxy".
        // The third argument indicates the PAC url.
        // The fourth argument is the proxy exclusion list.
        virtual void ProxySettingsChangedTo(
            JNIEnv*,
            const base::android::JavaParamRef<jobject>&,
            const base::android::JavaParamRef<jstring>&,
            jint,
            const base::android::JavaParamRef<jstring>&,
            const base::android::JavaParamRef<jobjectArray>&)
            = 0;

        // Called from Java (on JNI thread) to signal that the proxy settings have
        // changed. New proxy settings are fetched from the system property store.
        virtual void ProxySettingsChanged(
            JNIEnv*,
            const base::android::JavaParamRef<jobject>&)
            = 0;
    };

    ProxyConfigServiceAndroid(
        const scoped_refptr<base::SequencedTaskRunner>& network_task_runner,
        const scoped_refptr<base::SequencedTaskRunner>& jni_task_runner);

    ~ProxyConfigServiceAndroid() override;

    // Register JNI bindings.
    static bool Register(JNIEnv* env);

    // Android provides a local HTTP proxy that does PAC resolution. When this
    // setting is enabled, the proxy config service ignores the PAC URL and uses
    // the local proxy for all proxy resolution.
    void set_exclude_pac_url(bool enabled);

    // ProxyConfigService:
    // Called only on the network thread.
    void AddObserver(Observer* observer) override;
    void RemoveObserver(Observer* observer) override;
    ConfigAvailability GetLatestProxyConfig(ProxyConfig* config) override;

private:
    friend class ProxyConfigServiceAndroidTestBase;
    class Delegate;

    // For tests.
    ProxyConfigServiceAndroid(
        const scoped_refptr<base::SequencedTaskRunner>& network_task_runner,
        const scoped_refptr<base::SequencedTaskRunner>& jni_task_runner,
        GetPropertyCallback get_property_callback);

    // For tests.
    void ProxySettingsChanged();

    scoped_refptr<Delegate> delegate_;

    DISALLOW_COPY_AND_ASSIGN(ProxyConfigServiceAndroid);
};

} // namespace net

#endif // NET_PROXY_PROXY_CONFIG_SERVICE_ANDROID_H_
